The Box Cars are a pair of green vehicles with sliding doors which revealed some cargo boxes. One car is yellow, and the other is blue.
- Yellow and Green Box Car (from Conductor's Figure 8 Set)
- Zoo Box Car (from the Zoo Cars)
- Birthday Box Car
- Chicken Box Car (from the Sodor Chicken Cars)
- Sodor Milk Van (from the Sodor Dairy Cars)
- Musical Candy Cane Car (Sold with Holiday Thomas)
- Barnes and Noble Box Car
- Chapters Indigo Box Car
- Mr. Jolly's Chocolate Factory Box Car
- Chocolate Bunny Box Car (Sold in Percy and the Chocolate Bunny Car)
- Cow Car (from Toby and Bash on the Farm)
- Country Show Box Car (from Thomas' Country Show Delivery)
- Disguised Den (from Diesels in Disguise)
- Although there were boxcars in the Railway Series and the Television Series, these boxcars have a bright yellow, blue, and green livery, instead of a brown or grey livery, technically making them "non-canon" cars.
- The Box Cars are mostly comprised of plastic.
- When the doors are opened, you can see cargo inside and, in more recent variants, have sound played.
- For a short time in the early 2000s, a boxcar was packaged with Culdee.
- Some retail stores give out a free unpainted wooden boxcar with the purchase of 2 engines.